The American actress is wearing a Stella McCartney bespoke Bordeaux midi dress with a cinched waste and flowing sleeves. It is accessorized with matching ribboned fascinator by Philip Treacy and complementary "Demi" red satin bag by Gabriela Hearst.

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Poppy Delevingne

Poppy Delevingne, who was styled by Elizabeth Saltzman, is dressed in a periwinkle Oscar De La Renta dress and tweed coat, topped off with a blue feathered hat bespoke by Victoria Grant.

Kate Middleton arrived in a berry Alexander McQueen mid-length dress with simple black stilettos and and a matching fascinator. Prince William wore a black morning suit with a pastel blue vest and blue tie.

Lucia TonelliAssistant EditorLucia Tonelli is an Assitant Editor at Town & Country, where she writes about the royal family, culture, real estate, and more.

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